I have a 2006 S60 AWD, bought off lease at volvo dealership in 2006 with about 58000 kms. Now has about 155000 kms. Over the course of my ownership of 10 yrs have had to replace wheel bearings 5 times at volvo dealership...fronts done twice and once left rear. I think another wheel bearing has gone on right side...not sure if front or back wheel...loud rumbling noise that speeds up as car speeds up. Altho this car is awd, never had another car that needed wheel bearing replaced more than once ....one wheel...if at all. I dont drive the car hard nor put on many miles per year. Supposedly oem volvo replacement parts. Should this be happening this often?